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 S428 (left body gear). 5) Make sure that Bit 24 of label 272 is a 0 (NOT OPEN). 6) Remove the actuator from the alternate door warning sensor,
 S428.
 S 722-024
 (6)  Do a test of the door warning sensors for the right body gear with the CMC:
 WARNING: MAKE SURE THAT ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE
_______ DOOR OPERATION PATH. THE FAST MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS OR DAMAGE EQUIPMENT.
 (a)  Move the ground release handle for the right main gear door to the "Doors Open" position. 1) Put an actuator on the primary door warning sensor, S409
 (right body gear). 2) Make sure that Bit 28 of label 270 is a 0 (NOT OPEN). 3) Remove the actuator from the primary door warning sensor,
 S409. 4) Put an actuator on the alternate door warning sensor, S427
 (right body gear). 5) Make sure that Bit 28 of label 272 is a 0 (NOT OPEN). 6) Remove the actuator from the alternate door warning sensor,
 S427.
 H. Put the Airplane Back to Its Usual Condition
 S 442-037
 (1)  
Do this task: Put the Safety-Sensitive Systems Back to the
 Condition Before Air Mode Simulation (AMM 32-09-02/201).

 (2)
Move the control handle for the landing gear to the DN position.

 S 862-027
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747-400 MAINTENANCE MANUAL
 S 862-026
 WARNING: MAKE SURE THAT ALL PERSONS AND EQUIPMENT ARE CLEAR OF THE DOOR
_______ OPERATION PATH. THE FAST MOVEMENT OF THE DOORS CAN CAUSE INJURY TO PERSONS OR DAMAGE EQUIPMENT.
 (3)  
Move the ground release handles for the main gear doors to the "Doors Closed" position.

 S 862-025

 (4)  
Move the control handle for the landing gear to the OFF position.

 S 862-020

 (5)  
Remove electrical power if it is not necessary (AMM 24-22-00/201).

 S 862-021

 (6)  
Remove the hydraulic pressure from systems No. 1 and 4 if it is not necessary (AMM 29-11-00/201).

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747-400 MAINTENANCE MANUAL
 WING LANDING GEAR DOOR WARNING SENSOR - MAINTENANCE PRACTICES
_____________________________________________________________
 1.  General_______
 A.  This section has these two tasks:
 -Removal of the wing gear door warning sensors
 -
Installation of the wing gear door warning sensors.

 B.  
The door warning sensors for the wing gear are on the forward bulkhead of the wheel well.

 C.  
The procedure to remove and install the primary or the alternate sensors is the same.

 TASK 32-61-32-002-001
 2.  Remove the Door Warning Sensors for the Wing Landing Gear_________________________________________________________
 A.  Standard Tools and Equipment
 (1)  
Plastic scraper that is not abrasive or conductive

 B.  
References

 (1)  
09-11-00/201, Towing

 (2)  
32-00-30/201, Landing Gear Door Locks

 (3)  
32-09-02/201, Air/Ground Relay System

 (4)  
IPC 32-61-08 Fig. 2

 C.  
Access

 (1)  
Location Zone 135 Wing Gear Wheel Well, LH (Forward Bulkhead) 136 Wing Gear Wheel Well, RH (Forward Bulkhead)

 D.  
Prepare for the Removal

 S 492-002
 (1)  Make sure that all of the ground locks for the landing gear are installed (Ref 09-11-00/201).
 S 492-003
 WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO INSTALL
_______ THE DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT INSTALL THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
 (2)  Do this task: "Installation of the Door Locks on the Wing Landing Gear" (Ref 32-00-30/201).
　
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